Carpenter&#39;s clamp



Patented June 17, 1924.

sir-en era-res- P JOHN A. LUND, 0]? LONG BEACH, CALIFORNIA.

CARPENTERS CLAMP.'

Application filed December 14, 1922. Serial No. 606,891.

To aZZ whom it may concerwr Be itknown that I, JOHN A. Ilium), a

citizen of the United States, residing at Long Beach in the county of Los Angeles and State of California have invented a new and useful Carpenters Clamp, of which the following is a specification.

This invention relates to a carpenters clamp and the device is eXpected'to be es pecially useful to carpenters. when they are fitting doors in doorways. v been constructed for this purpose having clamping means for clamping a door jamb and having another clamp to engage the edge of a door or one end of the door, the door resting upon the floor 5 in this way the door is clamped inan upright position on the floor and in a convenient manner to enable the carpenter to plane its edges. When the door is-clamped in this way it frequently happens that workmen must pass through the doorway in carrying lumber or materials being used in the con struction of the building. There is also a wide variation in the thicknessof the door .jambs to which the clamp must be secured.

The general object of the present invention is to produce a carpenters clamp construeted in such a way that when the door is clamped in position the doorway will be obstructed as little as possible.

Further objects of the invention will appear hereinafter. I

The invention consists inthe novelparts and combination of parts to be described hereinafteiy all of which contribute to produce an eflicient carpenters clamp.

A preferred embodiment ofthe invention is described in the followingspecification while the broad scope of the invention is pointed out in the appended claims.

In the drawing:

Figure 1 is a plan of the device andindicating a door jamb in dotted lines to which the clamp is represented as applied; this view also illustrates the edge of a door secured by the clamp.

Fig. 2 is a vertical section taken on the line 2-2 of Figure 1.

Fig. 3 is a view similar to Figure 4 illustrating the device as applied to an unusually wide door jamb.

Fig. 4 is a longitudinal section taken through the joint which connects an extension bar to the main bar of the device, and

Clamps have Fig. 5 isa cross section taken on the line 55 of Figure 4.

The clamp comprises a frame 1 which is preferably of skeleton form and having a horizontal bar 2 extending horizontally from the frame see Figure 1. This bar 2 is preferably constructed so that it presents.

an angle form, that is to say, it should have a web and a flange at right angles to the web. I prefer to make this bar of channel form so that it presents a horizontal web 3 and two side flanges 4 which extendalong the edges of th web.

On the bar 2 I mount a stop 5 and I provide means whereby this stop can coop erate with a clampingscrew 6 mounted op; posite to. it on the frame 1. Any suitable means may'be'employed for preventing the stop 5 from slipping on the main bar 2 when the clampingscrew is tightened up so as to clamp the side members 7 of the door jamb between the clamp screw and the stop However for this purpose I prefer to construct the stop 5 with a saddle '8, see Figure 2 which is formed with an opening 9 which fits to the web and flange or flanges of the bar. I also prefer to provide means for securing the stop at a plurality of positions on the bar soas to adjust the gap.- between the stop and the clamping screw to the particular dimension orthickness of the door jamb to which the clamp is to be applied. For this purpose I provide the web 3 with a plurality of small openings 10 and I provide the saddle 8 with a removable pin 11 which is mounted in the saddle and'which will operate to pass through any one'of the openings 10 to secure the stop in different positions.

In some cases it may be necessary to apply the clamp to an unusually wide door amb, for example, a door amb carrying a foldlng door. Such a wide amb 1s illusing the clamp to be used with such a door jamb, I provide an extension bar 12 which preferably has the same cross section and dimensions as the main bar 2. I also provide the main bar and the extension bar *trated in dotted lines in Figure 3. In adapt- Cit iii)

the web 13 of the extension bar is'provided with openings 14 with which the pin 11 cothe web'3, the ends of the webs abutting against each other at their end faces 16, see Figure 41-. with means in the form of a pin or pins 17 which are dowel pins fixed in the tongue and having rounded outer ends which enable these pins to pass readily into a pair of the openings 10 adjacent the outer end of the main bar. The pins should fit neatly in the openings so that when the joint is formed they cooperate with the flanges and web 3 to hold the extension bar rigidly in position. It should be understood that while the flanges 4c cooperate with the tongue 15 to prevent a lateral swinging movement of the outer end of the extension bar, the dowel pins 17 resist the tension which is developed in the bar when the clamping screw 6 is tightened up.

While the extension bar is intended primarily to adapt the clamp for clan'iping unusually wide door jambs, it is obvious that the carpenter can also use the device as described above for clan'iping a number of boards together which are to be securedtogether by glue between their adjacent faces.

The clamping frame is also provided witha clamping socket 18 to facilitate the clamping of the'vertical edge of a door 19, with the lower edge of the door resting upon the floor.

The outer side of this, clamping socket'or gap 18 is formed by means of a stop 20 which is in the form of a tapered plate projecting substantially parallel with the longitudinal axis of the bar 2 and disposed in a substantially vertical plane. The outer side of this'stop is smooth and offers no obstructions which could interfere with a workman passing through the doorway. On the inner side of this stop20, that is to say, on the side of the stop disposed toward the longitudinal axis of the bar 2 I provide a'clamping screw 21 to cooperate with the stop 20, that is to say this screw is disposed in a horizontal plane with its axis disposed substantially at right angles to the axis of the I also provide the tongue 15' bar. By this arangement the wing heads 22 of the two screws are brought on the inner side of the frame as regards the doorway. This enables them to be operated more conveniently and also cooperates in producing an unobstructed passage past the clamp through the doorway.

l/Vhile I have described the clamping screw 21 as being disposed substantially at right angles to the longitudinal axis of the bar 2, it is obvious that if desired the clampin jaw 18 of the clamp can be formed so as to hold the door 19 in an inclined position instead of in a substantially parallel relation, as illustrated.

It is understood that the embodiment of the invention described herein is only one of the many embodiments this invention may take and I do not wish to be limited in the practice of my invention nor in my claims to the particular embodiment set forth.

I claim:

1. A clamping device comprising a frame having a bar extending therefrom, a stop having means for adjustably securing the same at different points on the bar, a clamping screw carried by the frame with its axis extending substantially parallel with said bar so as to cooperate with said step, said frame having a clamping socket with a stop on the outer side of said frame and projecting substantially parallel with but in the opposite direction from said bar, and a second clamping screw mounted on the inner side of the frame, cooperating with the second named stop and having its axis disposed in a plane substantially at right angles to the longitudinal axis of said bar.

2. A clamping device comprising a frame having a bar extending therefrom, a stop having means for adjustably securing the same at difierent points on the bar, a clamping screw carried by the frame with its axis extending substantially parallel with said bar so as to cooperatewith said stop, said frame having a clamping socket with a stop in'the form of a plate projecting from the frame in a direction opposite to the bar and substantially parallel to the longitudinal axis of the bar, anda second clamping screw mounted in the frame with'its head for rotating it located toward the other clamping screw, and cooperating with the last named stop, the outer side of said last named stop presenting an unobstructed face.

Signed at Los Angeles, Calif, this 7th day of December,1922.

JOHN A. UNDQ 

